Sony Cyber-shotDSC-HX30VSpecifications

overview Widest aperture (full zoom)

Widest aperture (full zoom)f/5.8

When fully zoomed in, most lenses don't let in as much light, but the more you zoom in the more light you need to avoid blur from camera shake. If you're buying a camera with a large zoom, make sure its got a wide aperture at full zoom.